131771656620 has 36 divisors (see below), whose sum is σ = 399707358960. Its totient is φ = 35139108384.

The previous prime is 131771656619. The next prime is 131771656637. The reversal of 131771656620 is 26656177131.

131771656620 is a `hidden beast` number, since 1 + 3 + 1 + 7 + 7 + 16 + 5 + 6 + 620 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 366032200 + ... + 366032559.

Almost surely, 2^131771656620 is an apocalyptic number.

131771656620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131771656620 is an abundant number, since it is smaller than the sum of its proper divisors (267935702340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131771656620 is a wasteful number, since it uses less digits than its factorization.

131771656620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732064774 (or 732064769 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 131771656620 in words is "one hundred thirty-one billion, seven hundred seventy-one million, six hundred fifty-six thousand, six hundred twenty".